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将3Cr2WSV钢制207轴承套圈塔形成形凹模(以下简称207凹模)的淬火温度提高到1150℃,回火温度提高到670°～680℃(回火后硬度降到HRC37～39),可显著提高模具的强韧性,消除了早期脆断,模具寿命由平均2000件提高到6000件。试验结果表明:模具材料的K_(IC)值可以较准确地反映出207凹模的抗脆断能力,α_K值则不能。3Cr 2W8V钢淬火回火后的K_(IC)值与硬度(HRC)值有一定的关系,回火到HRC40以下,可使3Cr2W8V的K_(IC)值大幅度增高。
The tempering temperature of 3Cr2WSV steel 207 bearing ring tower forming die (hereinafter referred to as 207 die) is increased to 1150 ° C, the tempering temperature is increased to 670 ° C to 680 ° C (the hardness after tempering is reduced to HRC 37-39) Can significantly improve the toughness of the mold, eliminating the early brittle fracture, mold life increased from an average of 2000 to 6000. The experimental results show that the K_ (IC) value of the mold material can accurately reflect the resistance to brittle fracture of the 207 die, and the α_K value can not. After quenching and tempering 3Cr 2W8V steel K_ (IC) value and hardness (HRC) values have a certain relationship, tempering below HRC40, 3Cr2W8V K_ (IC) value increased significantly.